JP2538646Y2 - Motorcycle frame - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motorcycle frame having an increased rigidity near a head pipe of a frame to which a front fork is mounted.

[0002]

2. Description of the Related Art When a motorcycle frame is made of steel pipe, as shown in FIG. 3, a front end of a main tube B is welded to an upper portion of a head pipe A to which a front fork is mounted.
The upper end of the down tube C is welded to the lower end of the head pipe A, and the main tube B and the down tube C are connected by the connecting tube D. Further, a reinforcing plate E is welded to both sides of the front portion, and the lower portion of the head pipe A, the down tube C and the reinforcing plates E on both sides are welded together with the second reinforcing plate F and the third reinforcing plate G. , So as to withstand the pushing force of the head pipe A by the front fork and the couple around the head pipe A.

[0003]

Since the lower part of the head pipe A is reinforced by the second reinforcing plate F and the third reinforcing plate G, there are many places for welding work, the number of parts increases, the cost increases, and the external appearance increases. Is also getting worse.

[0004] In view of the above, this invention can eliminate the second reinforcing plate and the third reinforcing plate by connecting the sub-tubes, reduce the number of welding points, increase rigidity, and improve the appearance. The purpose is to obtain a motorcycle frame.

[0005]

In order to achieve the above object, a motorcycle frame of the present invention extends a main tube welded on an upper portion of a head pipe to a rear side, and attaches an upper end of a down tube to a lower end of the head pipe. Welding, connecting the rear of the main tube and the down tube with a connecting tube, connecting the lower tube between the lower end of the head pipe and the lower surface of the main tube with a sub tube by penetrating the down tube, and welding with reinforcing plates on both sides of the front It is in.

[0006]

Since the components added to the head pipe can be received by the subtube, the rigidity can be increased even if the second reinforcing plate and the third reinforcing plate are omitted. In addition, the number of welding points is reduced, cost can be reduced, and the appearance near the head pipe can be improved.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The front end of the main tube 2 is welded to the upper part of the head pipe 1 where the front fork is mounted.
Further, the lower end of the head pipe 1 is welded to the lower tube 3 by applying the upper end thereof. Then, the rear portion of the main tube 2 and the down tube 3 are welded and connected by the connecting tube 4. The lower end of the head pipe 1 penetrates the notch or through hole of the upper end of the down tube 3, and the sub tube 5 is inserted and welded. The rear end of the sub tube 5 is connected to the connecting tube 4
Is welded to the lower surface of the main tube 2 on the front side. At the front left and right of the frame, a reinforcing plate 6 is attached and welded.

At the rear end of the main tube 2, the front ends of the left and right rear tubes 7 are welded, and the upper ends of the left and right center tubes 8 are welded. The lower ends of the left and right center tubes 8 and the lower tube 3 are connected by left and right lower tubes 9.

The lower end of the head pipe 1 and the main tube 2
The lower part of the head pipe 1 is connected by the sub-tube 5, the couple of the head pipe 1 can be received by the sub-tube 5, and the rigidity of the lower part of the head pipe 1 can be increased even if the reinforcing plate is reduced. Further, the number of welding points is reduced, the cost is reduced, and the appearance near the head pipe 1 is improved.

[0010]

As described above, since the present invention is constructed as described above, the sub-tube can receive a couple at the lower part of the head pipe 1, and the rigidity can be obtained even if the number of reinforcing plates is reduced. Can be higher. The cost can be reduced by reducing the number of welding points, and the appearance near the head pipe is also improved.

[Brief description of the drawings]

FIG. 1 is a side view of the vicinity of a head pipe of a frame showing an embodiment of the present invention.

FIG. 2 is an overall perspective view of the frame showing the embodiment of the present invention.

FIG. 3 is a side view of the vicinity of a head pipe of a frame showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head pipe 2 Main tube 3 Down tube 4 Connecting tube 5 Sub tube 6 Reinforcement plate

Claims (1)

(57) [Scope of request for utility model registration] 1. A main tube welded to an upper portion of a head pipe is extended rearward, an upper end of a down tube is welded to a lower end of the head pipe, a rear tube of the main tube is connected to the down tube by a connecting tube, and a lower end of the head pipe is connected to the lower end of the main pipe. A motorcycle frame, characterized in that a down tube is penetrated between the lower surfaces of the tubes and connected by a sub tube, and a reinforcing plate is attached to both sides of a front portion and welded.